20 Quick Results Guide
Digits
The SourceMeter can display readings at 3H-digit, 4H-digit, 5H-digit or 6H-digit
resolution. In situations where the last digits of the reading are noisy, you can turn those
digits off by decreasing display resolution.
To set display resolution, press the DIGITS key until the desired number of digits are
displayed. Another way to set display resolution is with the following menu sequence:
Press CONFIG > press DIGITS > select 3.5, 4.5, 5.5, or 6.5.
NOTE Changing DIGITS does not affect measurement SPEED, but changing measurement
speed does affect DIGITS.
Filter
Filtering is used to stabilize noisy readings. In general, the more filtering that is applied,
the more stable (and accurate) the reading. However, more filtering also means slower
speed.
The SourceMeter has a 3-stage filtering system: repeating, median, and moving. The auto
filter optimizes filter setting depending on selected measurement range.
Repeating filter
The stack is filled with the specified number of reading conversions. The reading
conversions are averaged to yield a filtered reading. The stack is then cleared, and the
process starts over. Use this filter for sweeping so readings for other source levels are not
averaged with the present source level.
Median filter
The median filter passes the middle-most reading from a group of readings that are sorted
by size. For example, with readings of 2mA, 1nA, and 3nA, the readings are first sorted in
ascending order (1nA, 3nA, 2mA), and then only the 3nA is passed through to the next
stage. The number of readings in the filter stack is determined by the rank, 0 to 5.
Moving filter
The first reading conversion is placed in the stack and is copied to the other stack locations
to fill it. Therefore, the first filtered reading is the same as the first reading conversion.
The stack type is first-in, first-out. Each subsequent conversion replaces one of the copied
readings in the stack, which is then averaged to yield the next filtered reading. Note that as
this process continues, a true average is not yielded until the stack is filled with new
reading conversions (no copies in stack).
Once the stack is filled, each subsequent conversion placed into the stack replaces the
oldest conversion. The stack is re-averaged, yielding a new filtered reading.
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